Ballpoint pen



FIG. 1 is a front perspective view of a ballpoint pen, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left elevational side view thereof;

FIG. 5 is a right elevational side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is an exploded fragmentary front elevational view thereof, with the writing tip exposed. 

The ornamental design for a ballpoint pen, as shown and described. 